A Halloween Party will be held at the Ann Arbor District Library . Songs, trick or treats at 9:30 to 10:00 AM and a second party at 10:30 to 11:00.
The Treat Parade, begins on Main Street at 11:00 and lasts for 6 hours. This annual event is a highlight for the children as they dress and walk down Main Street visiting all the merchants where there is balloons in front of the businesses. Over 50 merchants participate in the Treat Parade, and plan their routes down Ashley, Liberty, Washington, 4th Street and Washington.
A list of the following merchants participating in the Treat Parade can be found here.
Bean Stalks Play Café in Saline is also sponsoring a Downtown Boo Bash with the Downtown Merchants from 5-8 P.M. An old-fashion down-town Halloween street party.
Burns Park Costume Parade will begin at 2:15 on Friday. This is held and sponsored by the Burns Park PTO and the children dress in costumes, and walk around Burns Park and the block surrounding the school.
Night Terrors at Wiards Orchard is one of my families favorites. Surrouded by an apple orchard it turns into one of the scariest places to visit at Halloween. Night of Terrors in open all Fridays, Saturdays and Sundays in October. A list of all the attractions at Wiards Orchard can be found here.
There are Halloween Events throughout Michigan full of adult, family and children's activities see Madman Mikes Michigan Halloween Events.
For specific events in Ann Arbor, Saline, Dexter, Ypsilanti, and Milan and for discount coupons click here.
Subscribed to my blog for an update of events to Celebrate Halloween 2008. 
***Photos by lobo235 / Justin on Flickr ***
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Missy, wow, you are certainly connected with all the upcoming Halloween fun events around Ann Arbor. Hopefully you'll be able to pop into one or more yourself and enjoy this seasonal time of year. I would love to see that Treat Parade.